;------------------------------------------------------------------------------

;

; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>

; This program and the accompanying materials

; are licensed and made available under the terms and conditions of the BSD License

; which accompanies this distribution. The full text of the license may be found at

; http://opensource.org/licenses/bsd-license.php.

;

; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,

; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

;

; Module Name:

;

; CopyMem.asm

;

; Abstract:

;

; CopyMem function

;

; Notes:

;

;------------------------------------------------------------------------------

.686

.model flat,C

.mmx

.code

;------------------------------------------------------------------------------

; VOID *

; EFIAPI

; InternalMemCopyMem (

; IN VOID *Destination,

; IN VOID *Source,

; IN UINTN Count

; );

;------------------------------------------------------------------------------

InternalMemCopyMem PROC USES esi edi

mov esi, [esp + 16] ; esi <- Source

mov edi, [esp + 12] ; edi <- Destination

mov edx, [esp + 20] ; edx <- Count

lea eax, [esi + edx - 1] ; eax <- End of Source

cmp esi, edi

jae @F

cmp eax, edi ; Overlapped?

jae @CopyBackward ; Copy backward if overlapped

@@:

mov ecx, edx

and edx, 7

shr ecx, 3 ; ecx <- # of Qwords to copy

jz @CopyBytes

push eax

push eax

movq [esp], mm0 ; save mm0

@@:

movq mm0, [esi]

movq [edi], mm0

add esi, 8

add edi, 8

loop @B

movq mm0, [esp] ; restore mm0

pop ecx ; stack cleanup

pop ecx ; stack cleanup

jmp @CopyBytes

@CopyBackward:

mov esi, eax ; esi <- Last byte in Source

lea edi, [edi + edx - 1] ; edi <- Last byte in Destination

std

@CopyBytes:

mov ecx, edx

rep movsb

cld

mov eax, [esp + 12]

ret

InternalMemCopyMem ENDP

END